Pneumatic drill.



PATENTED JUNE 4, 1907.

P. H. MURPHY.

PNEUMATIC DRILL.

APPLIOATION FILED JUNE 16, m5.

UNITED sTATEs PETER H. MURPHY, OF ST. LOUIS, MISSOURI.

PNEUMATIC DRILL.

Application filed June 16,

To all whom it may concern.-

Be it known that I, PETER H. MURPHY, a citizen ofthe United States, anda resident of the city of St. Louis and State of Missouri, have inventeda new and useful Improvement in Pneumatic Drills, of which the followingis a specification.

My invention relates to pneumatic drills and has for its principalobjects to improve the bearing for the spindle and to provide for theproper oiling thereof.

It consists in the construction and in the arrangements and combinationsof parts hereinafter described.

The accompanying drawing, which forms part of this specification, is aview of a pneumatic drill showing the parts at the forward end thereofin longitudinal section.

The main frame of my machine is a casing 1 having parallel hollowtrunnionstherein, upon which are journaled oscillating engines whosepistons are connected to crank arms on shafts arranged parallel to thetrunnion. The hollow trunnions are connected up to a source of pressureand provided with release ports for the proper operation of theoscillating engines. As the actuating mechanism is well known in the artit is unnecessary to describe it in detail; it being suflicient forpresent purposes to state that pressure from the source of supplyeffects the actuation of the oscillating engines to bring about therotation of the shafts.

The shafts have pinions 2 fixed thereon which mesh with an internallytoothed gear wheel 3 mounted on the main spindle 4 of the drill. Thismain spindle is hollow; its interior being of polygonal shape adaptedfor the shank of a drill or other working tool to fit therein so as toturn with the spindle but be a free to move longitudinally therein.

The rear bearing of the main spindle is a roller bearing comprising acup 5 set into the hollow rear hub of the gear wheel 3 on the mainspindle and arranged to cooperate with a bearing cone 6 mounted on themain thrust bar 7 so as to constitute therewith a ball race forantifriction balls 8. The bearing cone has a hollow threaded sleevewhich works on the main thrust-bar and has a flanged portion overlappingthe front Wall of the casing. In order to provide for the proper oilingof the ball bearing, a tube 9 extends down in front of and alongside ofthe front wall of the casing from a port in the outer surface of thecasing to the ball race.

Specification of Letters Patent.

Patented June 4:, 1907'.

1905. Serial No. 265,506.

Mounted on the front wall of the casing is a bracket or shell 10 whichextends forwardly and constitutes a casing for the gear and pinions.This shell terminates in a hub 1.1, which is threaded interiorly toreceive an exteriorly threaded sleeve 12 which has holes 13 formed inits outer end to cooperate with a tool for adjusting it. The inner rearedge of this sleeve is beveled off to provide for the oiling of thespindle bearing as hereinafter stated.

The main spindle is provided with an annular rib or shoulder 14 againstwhose rear wall the front hub of the main gear abuts and around whichrib extends a spacing washer 15. The front bearing of the spindleconsists of a sleeve 16 of considerable length made of brass or othersuitable antifriction metal. The rear end of this sleeve has anoutwardly projecting flange which overlaps the rear end of the threadedsleeve 12. The portion of the spindle forward of this bearing sleeve 16is threaded to receive a nut 17 which is intended as a dust or dirt capto prevent chips entering between the spindle and its bearing. This dirtcap is held in position by means of a set screw 18 extending through itand against the spindle.

In order to provide for the proper lubrication of the front bearing, achannel or passageway 19 extends through the adjusting sleeve 12 andterminates in the beveled rear portion thereof. The .space between thebeveled end of this adjusting sleeve 12 and the flanged end of thebearing sleeve 16 thus constitutes an oil chamber which may be filledthrough the passageway 19. Lubricating holes 20 extend from this oilchamber radially through the bearing sleeve, and at an angle through theflange thereof to a point opposite the shoulder on the main spindle. Theoil channel in the adjusting sleeveis closed by a suitable screw plu 21;and the adjusting sleeve is held in position by a set nut or ring 22.

It is noted that the adjustment of the main spindle is effected entirelyby the single adjusting sleeve 12.

I/Vhat I claim as my invention and desire to secure by Letters Patentis 1. A pneumatic drill comprising a main frame, a main spindle, athrust bar in aline ment with said spindle, and a bearing interposedbetween said spindle and said thrust bar, a threaded hub supported bysaid main frame, a threaded sleeve working in said ICS hub, and aflanged bearing sleeve inside of said hub and having its flangeinterposed between the end of said adjusting sleeve and a shoulder onsaid spindle.

2. A pneumatic drill comprising a main frame, a spindle, a thrust bar inalineInent with said s indl'e, a ball bearing inter osed between saidspindle and said thrust ar, a threaded hub supported by said main frame,a threaded sleeve working on said hub, and aiflanged bearing sleeveinside of said hub and having its flange interposed between the end ofsaid adjusting sleeve and a shoulder on said spindle, the adjustingsleeve having an oil hole extending therethrough and. having its boreenlarged at its rear end toconstitute with the flanged bearing sleeve anoil chamber, and the bearing sleeve having holes opening into said oilchamber.

3. A pneumatic drill comprising a main frame, a spindle, a thrust bar inalinement with said spindle, a. ball bearing'interposed between saidspindle and said thrust bar, a threaded hub supported by said mainframe, a threaded sleeve working in said hub, and a flanged bearingsleeve inside of said hub and having its flange interposed between theend ,of said adjusting sleeve and a shoulder on said spindle, theadjusting sleeve having an oil hole extending therethrough and havingits inner rear edge beveled to constitute with the flanged bearingsleeve an oil chamber, and the bearing sleeve having holes opening intosaid oil chamber.

4. A pneumatic drill comprising a main frame, a main spindle, a thrustbar in alinement with said spindle, a ball bearing interposed betweensaid spindle and said thrust bar, a shell mounted on the main frame andarranged to constitute a hub for said s indle, and an oiltube'arrangedinside of said shell and extending from a hole in the surface thereof tosaid ball bearing.

5 A pneumatic drill comprising a main frame, a main spindle, a thrustbar in alinement with said spindle, a rear bearing interosed betweensaid spindle and said thrust bar, a threaded hub supported by said mainframe, a threaded sleeve working in said hub and a flanged sleeve insideof said first mentioned sleeve and constituting the front bearing forsaid spindle, said bearing sleeve having its flange interposed betweenthe end of said adj usting sleeve and the shoulder of said spindle.

St. Louis, Mo, June 10, 1905.

j 1 PETER I'I. MURPHY.

Witnesses J B. MEGowN, FRED F. REISNER.

